In a message dated 7/19/2005 12:01:28 P.M. Central Daylight Time, [EMAIL PROTECTED] writes:
But, all disk CCws also have a module number in the seek address that is now unused. Only device I know of that used it was the 'Noodle Snatcher' 2321? which was supported by MVT. The high-order 12 bits of the track or head number in seek addresses, search addresses, and count fields are also always 0 and could be used for some other addressing scheme by new microcode. And there are other schemes that could expand the effective number of bytes on one track to much more than 56664. Since all new storage processors (Mark Friedman's term) for the last several years have virtualized the CKD cylinder, track, and record architecture by mapping it onto only-the-vendor-knows-what kind of real, RAIDed FBA, the obsolete 2-byte Data Cell Bin Number could easily be recycled into part of a new addressing scheme, all of which would still be virtual from mainframe-centric software's point of view. Bill Fairchild ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
